US3832808A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Abrasive belt-type lumber planing machine
Assignee: Timesavers Inc
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Filing: 1973-07-09
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Granted: 1974-09-03
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Expires: 1993-07-09
Abstract
Abstract An abrasive belt-type lumber planing and dressing machine in which the workpiece is fed horizontally through the machine by the top stretch of an endless conveyor belt, to have its upwardly facing surface acted upon by a contact drum-supported endless abrasive belt traveling at high speed, and in which a downwardly biased infeed pressure shoe holds the workpiece down on the conveyor belt along a transversely extending area just ahead of the zone of contact between the workpiece and the abrasive belt, the pressure shoe being mounted in the machine by a parallelogram linkage which maintains the toe of the pressure shoe at substantially the same distance from the zone of contact between the workpiece and the abrasive belt despite changes in the elevation of the pressure shoe caused by variations in workpiece thickness.
Inventors
- 👤 F Kiser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 01:30
CPC Classifications
B; B24; B24B; B24B21/00; B24B21/04; B24B21/12
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
222 words
In an abrasive belt-type lumber planing machine wherein workpieces to be sized are fed horizontally through the machine by the platen-supported top stretch of a conveyor belt mounted in the frame of the machine, with the top surface of the workpiece in contact with the underside of a contact drum-supported abrasive belt, and wherein a downwardly biased pressure shoe has a toe portion that engages the workpiece and holds it down on the platen-supported stretch of the conveyor belt along a zone that extends transversely across the workpiece closely adjacent to the zone of contact between the workpiece and the abrasive belt, the improvement whereby upon up and down movement of the pressure shoe resulting from variations in workpiece thickness, the toe of the pressure shoe moves in an arc substantially concentric to the contact drum, so that the pressure shoe exerts downward pressure upon the workpiece at substantially the same distance from said zone of contact regardless of variations in workpiece thickness, and which improvement comprises a parallelogram linkage mounting and connecting the pressure shoe with the frame of the machine, two of the four axes of said linkage being fixed with respect to the machine frame and the other two being fixed with respect to the pressure shoe, and all of said axes being parallel with the contact drum axis.
Claim 2
Dependent Claim
222 words
In an abrasive belt-type lumber planing machine wherein workpieces to be sized are fed horizontally through the machine by the platen-supported top stretch of a conveyor belt mounted in the frame of the machine, with the top surface of the workpiece in contact with the underside of a contact drum-supported abrasive belt, and wherein a downwardly biased pressure shoe has a toe portion that engages the workpiece and holds it down on the platen-supported stretch of the conveyor belt along a zone that extends transversely across the workpiece closely adjacent to the zone of contact between the workpiece and the abrasive belt, the improvement whereby upon up and down movement of the pressure shoe resulting from variations in workpiece thickness, the toe of the pressure shoe moves in an arc substantially concentric to the contact drum, so that the pressure shoe exerts downward pressure upon the workpiece at substantially the same distance from said zone of contact regardless of variations in workpiece thickness, and which improvement comprises a parallelogram linkage mounting and connecting the pressure shoe with the frame of the machine, two of the four axes of said linkage being fixed with respect to the machine frame and the other two being fixed with respect to the pressure shoe, and all of said axes being parallel with the contact drum axis.
Claim 3
Dependent Claim
202 words
In an abrasive belt-type lumber planing machine, the improvement defined in claim 1 wherein said parallelogram linkage by which the pressure shoe is mounted comprises: A. a first cross shaft extending transversely across the machine; B. coaxial bearings fixed with respect to the frame of the machine and having the end portions of said first cross shaft journalled therein; C. a first pair of spaced apart parallel links fixed to said first cross shaft and projecting radially therefrom in the same direction, to have their free ends swing in an arc about the axis of said first cross shaft; D. a second cross shaft extending transversely across the machine in parallel spaced relation to said first cross shaft, said second cross shaft having its end portions connected to the free ends of said pair of links; E. bearing means on the pressure shoe having said second cross shaft journalled therein; F. a second pair of parallel links; G. first coaxial pivot means rockably connecting the same end of each of said second pair of links with the machine frame; and H. second coaxial pivot means rockably connecting the other end of each of said second pair of links with the pressure shoe.
Claim 4
Dependent Claim
28 words
the axes of said second cross shaft and of said second coaxial pivot means lie in a substantially horizontal plane spaced downwardly from said other substantially horizontal plane.
Claim 5
Dependent Claim
28 words
the axes of said second cross shaft and of said second coaxial pivot means lie in a substantially horizontal plane spaced downwardly from said other substantially horizontal plane.
Claim 6
Dependent Claim
18 words
In an abrasive belt-type lumber planing machine, the improvement set forth in claim 2, further characterized in that
Claim 7
Dependent Claim
41 words
The abrasive belt-type luMber planing machine of claim 3, wherein the toe of the pressure shoe lies in a plane spaced a short distance below said plane containing the axes of the second cross shaft and the second coaxial pivot means.
Claim 8
Dependent Claim
137 words
The abrasive belt-type lumber planing machine of claim 4, wherein all of said links are at all times substantially parallel to one another and project downwardly from the axes of their connections with the machine frame at an inclination away from the toe of the pressure shoe and at an angle to the vertical that is less than 45*, so that the pivotal connections of the links with the pressure shoe move along arcuate paths having both a vertical and a horizontal component as the elevation of the pressure shoe changes, and wherein the means by which the pressure shoe is biased downward comprises a compression spring reacting between the machine frame and the pressure shoe and arranged to urge the pressure shoe horizontally towards the contact zone between the contact drum-supported abrasive belt and the workpiece.
Claim 9
Dependent Claim
29 words
In an abrasive belt-type lumber planing machine, the improvement set forth in claim 5, further characterized by stop means to limit the spring produced movement of the pressure shoe.
Claim 10
Dependent Claim
30 words
In an abrasive belt-type lumber planing machine, the improvement set forth in claim 6, further characterized by other stop means to adjustably limit spring opposed movement of the pressure shoe.
Claim 11
Dependent Claim
102 words
In an abrasive belt-type lumber planing machine, the improvement set forth in claim 5, wherein near each end of the pressure shoe there is a substantially vertical wall fixed with respect to the machine frame, wherein the pressure shoe has an endwise projecting rigid arm on each end thereof located between said vertical wall and the contact zone, wherein two compression springs reacting through the parallelogram linkage hold the toe of the pressure shoe down on the workpiece, and wherein said compression springs react between said substantially vertical wall and the endwise projecting rigid arm at each end of the pressure shoe.
Claim 12
Dependent Claim
198 words
In an endless belt-type sanding machine having a sanding head with an endless power driven sanding belt and conveyor means to carry workpieces horizontally through the machine with the top surface thereof in engagement with the sanding belt of the sanding head, and a pressure shoe to hold workpieces down on the conveyor means, the improvement which comprises: A. linkage means pivotally connected with the pressure shoe and with the frame of the machine, the latter connection being at an elevation above the pressure shoe, said linkage means mounting the pressure shoe in the machine and constraining the shoe to movement in an arcuate path having both a horizontal and a vertical component, the former being greater than the latter; and B. spring means reacting along a substantially horizontal line between the pressure shoe and the frame of the machine and applying a force on the pressure shoe urging the workpiece engaging portion thereof horizontally towards the zone of engagement between the workpiece and the sanding belt, whereby the resultant downward component of the arcuate movement to which the pressure shoe is constrained presses the toe of the pressure shoe solidly against a workpiece on the conveyor means.
Claim 13
Dependent Claim
198 words
In an endless belt-type sanding machine having a sanding head with an endless power driven sanding belt and conveyor means to carry workpieces horizontally through the machine with the top surface thereof in engagement with the sanding belt of the sanding head, and a pressure shoe to hold workpieces down on the conveyor means, the improvement which comprises: A. linkage means pivotally connected with the pressure shoe and with the frame of the machine, the latter connection being at an elevation above the pressure shoe, said linkage means mounting the pressure shoe in the machine and constraining the shoe to movement in an arcuate path having both a horizontal and a vertical component, the former being greater than the latter; and B. spring means reacting along a substantially horizontal line between the pressure shoe and the frame of the machine and applying a force on the pressure shoe urging the workpiece engaging portion thereof horizontally towards the zone of engagement between the workpiece and the sanding belt, whereby the resultant downward component of the arcuate movement to which the pressure shoe is constrained presses the toe of the pressure shoe solidly against a workpiece on the conveyor means.
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) | 1977-09-02 | 1978-03-04 | 1978-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-02 | 1982-03-04 | 1982-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-02 | 1986-03-04 | 1986-09-03 | $7700.00 | Window Closed / Lapsed |