US3877324A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Grinder for saw bar mounted saw chain
Assignee: Individual
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Filing: 1974-04-29
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Granted: 1975-04-15
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Expires: 1994-04-29
Abstract
Abstract A machine for grinding saw chain on a chain saw bar includes a stand mounting a saw bar clamp and a new support table offset laterally from the clamp at the end of a swing arm carried by the stand. The saw support and clamp pivot about coincident vertical axis which pass through the lowermost grinding edge of a grinding wheel having an inclined axis of rotation in a vertical plane passing through such pivot axes so that the saw and bar can be swung together from one grinding position to another for sharpening both left-hand and right-hand cutter links without changing the wheel or saw adjustment. An adjustable chain holddown pawl on the bar clamp positions each cutter link on the bar for grinding and stabilizes the saw chain on the bar while permitting forward movement of the chain along the bar to advance successive cutter links into grinding position. The grinding wheel pivots between a retracted position permitting forward movement of the chain on the bar and a grinding position in which its lowermost edge grinds a properly positioned cutter element on the saw bar. The axis of the grinding wheel is adjustable in a straight line in its vertical plane parallel to the wheel faces to compensate for wheel wear without requiring other adjustments of the machine or chain saw.
Inventors
- 👤 Elmer Ray Silvey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:36
CPC Classifications
B; B23; B23D; B23D63/00; B23D63/08; B23D63/16; B23D63/166
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
276 words
In a machine for sharpening the cutter elements of a saw chain while such chain remains on the bar of a chain saw, including a disc-shaped grinding wheel and wheel support means mounting said wheel for rotation about its central axis, saw bar clamping means for clamping a saw bar in a vertical disposition below said grinding wheel with a saw chain on said bar, said saw bar clamping means being pivotable about a vertical pivot axis passing through said area of grinding engagement of said grinding wheel to first and second positions of adjustment for grinding right and left-hand cutter elements respectively, adjustable saw chain hold-down means operable to permit forward movement of a saw chain on said saw bar and to hold a cutter link of the saw chain down against said saw bar and in an adjustable position relative to said area of grinding engagement of said wheel for receiving an edge of said wheel in grinding position with respect to a cutter element of said chain in either of said first and second positions of adjustment of said clamping means, and chain saw support means offset laterally from said clamping means for supporting the chain saw while said saw bar is clamped in said clamping means, said saw support means being swingable about a vertical swing axis coincident with said vertical pivot axis of said clamping means such that swinging movement of said saw support about said vertical swing axis causes a corresponding pivoting movement of said clamping means about its said pivot axis when a chain saw on said saw support means has its saw bar clamped in said clamping means.
Claim 2
Dependent Claim
276 words
In a machine for sharpening the cutter elements of a saw chain while such chain remains on the bar of a chain saw, including a disc-shaped grinding wheel and wheel support means mounting said wheel for rotation about its central axis, saw bar clamping means for clamping a saw bar in a vertical disposition below said grinding wheel with a saw chain on said bar, said saw bar clamping means being pivotable about a vertical pivot axis passing through said area of grinding engagement of said grinding wheel to first and second positions of adjustment for grinding right and left-hand cutter elements respectively, adjustable saw chain hold-down means operable to permit forward movement of a saw chain on said saw bar and to hold a cutter link of the saw chain down against said saw bar and in an adjustable position relative to said area of grinding engagement of said wheel for receiving an edge of said wheel in grinding position with respect to a cutter element of said chain in either of said first and second positions of adjustment of said clamping means, and chain saw support means offset laterally from said clamping means for supporting the chain saw while said saw bar is clamped in said clamping means, said saw support means being swingable about a vertical swing axis coincident with said vertical pivot axis of said clamping means such that swinging movement of said saw support about said vertical swing axis causes a corresponding pivoting movement of said clamping means about its said pivot axis when a chain saw on said saw support means has its saw bar clamped in said clamping means.
Claim 3
Dependent Claim
72 words
The machine of claim 1 including means for moving said grinding wheel and said clamping means relative to one another to selectively move said wheel into and away from said grinding position, said axis of said wheel being in a vertical plane passing through the lowermost edge of said wheel and through said vertical axes of said clamping means and said saw support means when said wheel is in said grinding position.
Claim 4
Dependent Claim
27 words
The machine of claim 1 wherein said saw support means includes means for vertical adjustment of said support means relative to the level of said clamping means.
Claim 5
Dependent Claim
26 words
The machine of claim 1 wherein said clamp means includes means for adjusting the height of the top edge of said saw bar within clamp means.
Claim 6
Dependent Claim
54 words
The machine of claim 1 wherein said adjustable hold-down means includes means mounting said hold-down means on said clamping means for adjustment both vertically with respect to the top edge of a saw bar held by said clamping means and horizontally with respect to its distance from the lowermost edge of said grinding wheel.
Claim 7
Dependent Claim
91 words
The machine of claim 1 wherein said adjustable hold-down means includes hold-down pawl means and pawl support means, said pawl support means being adjustably mounted on said clamp means for adjusting the hold-down position of said pawl means, said pawl means including three interchangeable hold-down pawls, one for use with saw chain having cutter elements of normal lengths and the other two for use with the right and left-hand cutter links respectively of saw chain having cutter elements of abnormally short lengths, said pawl support means including quick change pawl-mounting means.
Claim 8
Dependent Claim
55 words
The machine of claim 6 wherein said quick change pawl-mounting means includes a mounting pin for pivotally mounting said pawls on said pawl support means and a resilient retainer sleeve sized to slip onto and off of said pin and to grip said pin when thereon to hold a selected said pawl in operating position.
Claim 9
Dependent Claim
81 words
The machine of claim 1 wherein said clamping means includes a pair of laterally opposed and spaced-apart upstanding clamp portions defining a slot therebetween for receiving a saw bar therebetween, one of said upstanding clamp portions including an inner planar vertical abutment face for abutment with one side surface of the saw bar, the other of said upstanding clamp portions including an adjustable clamping member movable toward and away from said abutment face to clamp the saw bar against said face.
Claim 10
Dependent Claim
67 words
The machine of claim 8 wherein said one upstanding clamp portion includes abutment face-adjustment means for horizontal adjustment of said abutment face toward and away from said other upstanding clamp portion to compensate for saw bars of different thicknesses whereby saw bars of different thicknesses can be clamped in said clamping means with their vertical median planes passing through said area of grinding engagement of said wheel.
Claim 11
Dependent Claim
61 words
The machine of claim 1 wherein said clamping means includes a turntable portion and mounting means pivotally mounting said turntable portion for pivoting movement about said vertical pivot axis relative to a machine base portion, said mounting means including friction-inducing drag means for inhibiting said pivoting movement and thereby tending to retain said clamping means in a preselected position of adjustment.
Claim 12
Dependent Claim
22 words
The machine of claim 6 wherein said clamping means includes means for storing two of said three pawls when not in use.
Claim 13
Dependent Claim
40 words
The machine of claim 1 wherein the lowermost edge portion of said grinding wheel defines said area of grinding engagement, said vertical pivot and swing axes passing through said lowermost edge portion when said wheel is in said grinding position.
Claim 14
Dependent Claim
112 words
The machine of claim 1 wherein said wheel support means mounts said wheel for movement between a retracted position permitting forward movement of said chain on said saw bar and a said grinding position in which the lowermost edge portion of said wheel defines said area of grinding engagement, said vertical swing and pivot axes passing through said lowermost edge portion and being in the vertical plane of the center axis of said wheel when said wheel is in said grinding posiTion, said wheel support means including adjustment means for shifting said center axis in a straight line in said vertical plane to compensate for wear of the edge of said wheel.
Claim 15
Dependent Claim
105 words
The machine of claim 13 wherein said clamping means inclues a pair of laterally opposed and spaced-apart upstanding clamp portions defining a slot therebetween for receiving a saw bar, one of said upstanding clamp portions including an inner planar vertical abutment face for abutment with one side surface of the saw bar, the other of said upstanding clamp portions including an adjustable clamping member movable toward and away from said abutment face to clamp the saw bar against said face, said upstanding clamp portions being supported on a turntable base portion pivoted to a fixed base member of said machine for frictionally inhibited pivoting movement.
Claim 16
Dependent Claim
67 words
The machine of claim 14 wherein said one upstanding clamp portion includes abutment face adjustment means for horizontal adjustment of said abutment face toward and away from said other upstanding clamp portion to compensate for saw bars of different thicknesses whereby saw bars of different thicknesses can be clamped in said clamping means with their vertical median planes passing through the lowermost edge portion of said wheel.
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) | 1978-04-14 | 1978-10-14 | 1979-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-14 | 1982-10-14 | 1983-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-14 | 1986-10-14 | 1987-04-15 | $7700.00 | Window Closed / Lapsed |