US3858868A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-centering sawmill dog
Assignee: ZAGRAY WILLIAM
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Filing: 1973-12-10
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Granted: 1975-01-07
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Expires: 1993-12-10
Abstract
Abstract A sawmill dog assembly has both top and bottom gripping teeth which are made self-centering by mounting them on a slide member which can move vertically on the frame of the assembly, so that when the top tooth is in engagement with the log, the bottom tooth moves upward as a screw-spindle is rotated, and when both teeth engage the log, they bite into it with equal force when the screw-spindle is tightened, thereby gripping the log securely without shifting or twisting it. The gripping teeth are mounted on a sleeve member so that they pivot in unison to a retracted position when not in use.
Inventors
- 👤 Stanley Zagray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:29
CPC Classifications
B; B27; B27B; B27B29/00; B27B29/08; Y; Y10; Y10T; Y10T83/00; Y10T83/647; Y10T83/6492; Y10T83/6499; Y10T83/6508; Y10T83/6515; Y10T83/6518; Y10T83/652; Y10T83/6521
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
254 words
A self-centering sawmill dog assembly having a frame rigidly mountable on a log-positioning structure for feeding a log to the saw along a fixed rectilinear path and comprising a slide member mounted on said frame for movement relative thereto in a direction perpendicular to the path of said positioning structure, a screw-spindle rotatably supported on said slide member for rotation about its longitudinal axis and mounted against longitudinal movement relative to said slide member, the longitudinal axis of said screwspindle being disposed parallel to the direction of movement of said slide member, a sleeve member mounted on said slide member with said screwspindle extending co-axially through it, said sleeve member having an elongated slot extending parallel with said screwspindle for access thereto, first gripping tooth-means mounted on said slide member for movement therewith, second gripping tooth-means supported on said sleeve member for movement longitudinally thereof and having a screw-engaging element extending through said access slot into meshing engagement with said screw-spindle, such that rotation of said screw-spindle moves said second gripping tooth-means longitudinally of said sleeve member toward and away from said first gripping tooth-meaNs, and means for rotating said screw-spindle such that upon rotation thereof in one direction when said second gripping tooth-means is in engagement with a log said slide member is moved on said frame in the direction of said first gripping tooth-means, whereupon continued rotation of said screw-spindle in the same direction causes said gripping tooth-means to bite with equal force in opposite directions into clamping engagement with the log.
Claim 2
Dependent Claim
254 words
A self-centering sawmill dog assembly having a frame rigidly mountable on a log-positioning structure for feeding a log to the saw along a fixed rectilinear path and comprising a slide member mounted on said frame for movement relative thereto in a direction perpendicular to the path of said positioning structure, a screw-spindle rotatably supported on said slide member for rotation about its longitudinal axis and mounted against longitudinal movement relative to said slide member, the longitudinal axis of said screwspindle being disposed parallel to the direction of movement of said slide member, a sleeve member mounted on said slide member with said screwspindle extending co-axially through it, said sleeve member having an elongated slot extending parallel with said screwspindle for access thereto, first gripping tooth-means mounted on said slide member for movement therewith, second gripping tooth-means supported on said sleeve member for movement longitudinally thereof and having a screw-engaging element extending through said access slot into meshing engagement with said screw-spindle, such that rotation of said screw-spindle moves said second gripping tooth-means longitudinally of said sleeve member toward and away from said first gripping tooth-meaNs, and means for rotating said screw-spindle such that upon rotation thereof in one direction when said second gripping tooth-means is in engagement with a log said slide member is moved on said frame in the direction of said first gripping tooth-means, whereupon continued rotation of said screw-spindle in the same direction causes said gripping tooth-means to bite with equal force in opposite directions into clamping engagement with the log.
Claim 3
Dependent Claim
61 words
A self-centering sawmill dog assembly as defined in claim 1, in which said sleeve member is pivotally mounted on said slide member, whereby said gripping tooth-means are pivotable in unison with said sleeve member between an inoperative position in which said gripping tooth-means are disposed substantially parallel with the log and an operative position in which they are substantially perpendicular thereto.
Claim 4
Dependent Claim
24 words
A self-centering sawmill dog assembly as defined in claim 2, which further includes means for resiliently urging said gripping tooth-means toward their inoperative position.
Claim 5
Dependent Claim
71 words
A self-centering sawmill dog assembly as defined in claim 3, wherein said screw-engaging element of said second gripping tooth-means is retractably mounted and is provided with means for urging it into meshing engagement with said screw-spindle and means for withdrawing it from such engagement, so that said second tooth-means can be disengaged from said screw-spindle and rapidly moved lengthwise of said sleeve member into or out of engagement with a log.
Claim 6
Dependent Claim
103 words
A self-centering sawmill dog assembly as defined in claim 4, wherein said first gripping tooth-means comprises an elongated member pivoted at one end to a portion fixed to said sleeve member for moving the opposite end of said elongated tooth-member in the direction of said second gripping tooth-means, and which further includes an abutment member disposed adjacent said one end of said elongated tooth-member, as well as a cam-surface on said slide member disposed for engagement by said abutment member such that when said gripping tooth-means are pivoted toward their operative position said cam-surface pivots said elongated tooth-member toward said second gripping tooth-means.
Claim 7
Dependent Claim
71 words
A self-centering sawmill dog assembly as defined in claim 1, wherein said screw-engaging element of said second gripping tooth-means is retractably mounted and is provided with means for urging it into meshing engagement with said screw-spindle and means for withdrawing it from such engagement, so that said second tooth-means can be disengaged from said screw-spindle and rapidly moved lengthwise of said sleeve member into or out of engagement with a log.
Claim 8
Dependent Claim
64 words
A self-centering sawmill dog assembly as defined in claim 1, which further includes means for limiting the movement of said slide member relative to said frame, said limiting means comprising a slot in a portion of said frame elongated in a direction parallel to the direction of movement of said slide member and a pin mounted on said slide member extending through said slot.
Claim 9
Dependent Claim
70 words
A self-centering sawmill dog assembly as defined in claim 7, wherein said slide member is provided with a series of spaced threaded holes disposed along said slot and said pin comprises a screw threadedly engaged with one of said holes and having a head portion engageable with said frame adjacent said slot for binding said slide member in position relative to said frame when said screw is turned up tight.
Claim 10
Dependent Claim
47 words
A self-centering sawmill dog assembly as defined in claim 8, wherein said means for limiting the movement of said slide member further includes an adjustment member movably mounted on said frame adjacent one end of said slot for movement longitudinally thereof into the path of said screw.
Claim 11
Dependent Claim
72 words
A self-centering sawmill dog assembly as defined in claim 9, wherein said adjustment member comprises a stop-plate adjustably mounted within a recess in said frame for movement into said slot and effectively reducing the length thereof, said frame having an opening into said Recess elongated in the direction of said slot with a set-screw extending through said opening into threaded engagement with said stop-plate for fixing said stop-plate in an adjusted position.
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) | 1978-01-06 | 1978-07-08 | 1979-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-06 | 1982-07-08 | 1983-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-06 | 1986-07-08 | 1987-01-07 | $7700.00 | Window Closed / Lapsed |