Patent US5343412A successfully refreshed from Google Patents.
US3789552A
Expired / Lapsed
US
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Tracking mechanism for belt sanders
Assignee: Singer Co
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Filing: 1972-09-12
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Granted: 1974-02-05
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Expires: 1992-09-12
Abstract
Abstract A tracking mechanism for centering a sanding belt of a belt sander, wherein a linkage means is connected to the frame of the sander. The linkage means carries a mounting bracket to which an idler pulley is rotatively connected. The linkage means has a plurality of links pivotally interconnected to each other to form a frusto-polyhedron whose vertex defines a pivot point disposed forwardly of the idler pulley, so that when unbalanced forces act on one side of the idler pulley, the linkage means will be caused to rotate about the pivot point to produce a turning movement thereabout, and cause the opposite side of the idler pulley to counteract the initial forces by shifting and restoring the idler pulley to a balanced position. The pivot center line intersects a plane passing through the center line of the sanding belt, which plane is substantially perpendicular to the axis of the pulley. This location of the pivot point also will serve to aid tracking of, and limit runoff of the sanding belt from the pulley.
Inventors
- 👤 D Bradbury
- 👤 C Huey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:43
CPC Classifications
B; B24; B24B; B24B23/00; B24B23/06; B24B21/00; B24B21/18
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
85 words
A tracking mechanism for centering a sanding belt of a belt sander comprising: a. a frame, b. a bar linkage means connected to the frame and having a plurality of bars, c. a mounting bracket connected to the linkage means, d. an idler pulley rotatively connected to the mounting bracket and having an axis of rotation, and e. the bars pivotally connected to one another along revolute axes which axes intersect at a vertex disposed forwardly of the axis of rotation of the idler pulley.
Claim 2
Dependent Claim
85 words
A tracking mechanism for centering a sanding belt of a belt sander comprising: a. a frame, b. a bar linkage means connected to the frame and having a plurality of bars, c. a mounting bracket connected to the linkage means, d. an idler pulley rotatively connected to the mounting bracket and having an axis of rotation, and e. the bars pivotally connected to one another along revolute axes which axes intersect at a vertex disposed forwardly of the axis of rotation of the idler pulley.
Claim 3
Dependent Claim
30 words
The combination claimed in claim 1 wherein: a. the sanding belt has a longitudinal center line, and b. the vertex lies in a plane passing through the longitudinal center line.
Claim 4
Dependent Claim
44 words
The combination claimed in claim 1 wherein: a. one of the bars formed integrally with the frame, b. another of the bars formed integrally with the mounting bracket, and c. a pair of spaced bars pivotally interconnected between the frame and the mounting bracket.
Claim 5
Dependent Claim
24 words
The combination claimed in claim 3 wherein: a. spring means connected to the bar linkage means yieldably to separate the bars from one another.
Claim 6
Dependent Claim
89 words
The combination claimed in claim 4 wherein: a. the vertex located in a plane which intersects the centerline of the sanding belt as said centerline approaches the idler pulley, b. the axis of rotation of the idler pulley is disposed transversely of said centerline in a normally perpendicular position to a plane passing through said centerline, and c. the bar linkage means to rotate about the vertex responsive to shifting of said axis of rotation to restore the perpendicular position thereof and to prevent runoff of said sanding belt.
Claim 7
Dependent Claim
60 words
The combination claimed in claim 1 wherein: a. the bar linkage means including four bars defining a frusto-polyhedron having its vertex at said vertex point whereby shifting of the idler pulley will cause said bar linkage means to pivot about said vertx point to create a turning movement thereabout to urge the idler pulley to return to its original position.
Claim 8
Dependent Claim
127 words
A belt sander comprising: a. a frame, b. a power driven pulley mounted in the frame, c. an idler pulley disposed in the frame in spaced relation to the driven pulley, d. a sanding belt connected to rotate about the driven pulley and the idler pulley, e. a mounting means for the idler pulley connected to the frame to maintain the axis of the idler pulley perpendicular to the plane of the centerline of the sandpaper, and f. the mounting means including a bar linkage means having a plurality of bars pivotally connected to one another to form at said connections revolute axes intersecting at a point lying in the plane of the centerline of the sanding belt and forwardly of the axis of the idler pulley.
Claim 9
Dependent Claim
127 words
A belt sander comprising: a. a frame, b. a power driven pulley mounted in the frame, c. an idler pulley disposed in the frame in spaced relation to the driven pulley, d. a sanding belt connected to rotate about the driven pulley and the idler pulley, e. a mounting means for the idler pulley connected to the frame to maintain the axis of the idler pulley perpendicular to the plane of the centerline of the sandpaper, and f. the mounting means including a bar linkage means having a plurality of bars pivotally connected to one another to form at said connections revolute axes intersecting at a point lying in the plane of the centerline of the sanding belt and forwardly of the axis of the idler pulley.
Claim 10
Dependent Claim
52 words
The combination claimed in claim 7 wherein: a. a plate member defined by each of the bars, b. the plate members hinged-connected to one another to form a polyhedron having a vertex at said point whereby the sides of the plate members converge toward one another in the direction of said vertex.
Claim 11
Dependent Claim
47 words
The combination claimed in claim 8 wherein: a. spring means connected in the hinge connections, and b. the bar linkage means to pivot about said vertex responsive unbalanced tensions on said sanding belt to create movements thereabout tending to restore said sanding belt to a balanced 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) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |