US3743113A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carriage drive means for lumber stacker
Assignee: Moore Dry Kiln Company of Canada Ltd
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Filing: 1972-01-03
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Granted: 1973-07-03
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Expires: 1992-01-03
Abstract
Abstract A lumber stacking apparatus is described having a reciprocating carriage with a forked arm assembly for picking up a course of boards at a course pickup station and carrying the course to a course stacking station. The carriage is provided with a crank drive mechanism for reciprocating the carriage. The crank drive mechanism has a crank shaft with a cam thereon that operates a bell crank to, (1) raise the forked arm assembly at the course pickup station to pick up a course of boards; (2) maintain the forked arm assembly elevated during movement to the course stacking station, and (3) lower the forked arm assembly at the course stacking station in front of a stripping means.
Inventors
- 👤 J Burton
- 👤 G Eaton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:21
CPC Classifications
B; B65; B65G; B65G57/00; B65G57/02; B65G57/16; B65G57/18
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
225 words
In a lumber stacking apparatus: means for reciprocating a carriage between a course pickup station and a course stacking station and for vertically moving a course support means on the carriage to pick up a course of boards at the course pickup station and to maintain the course support means elevated as the carriage is moved from the course pickup station to the course stacking station and to lower the course of boards at the course stacking station, comprising: a rotatable crank shaft; a crank arm mechanism operatively connected between the carriage and the crank shaft to reciprocate the carriage between the course pickup station and the course stacking station in response to the rotation of the crank shaft; cam means operatively connected to and driven by the crank shaft in timed relation with the movement of the crank arm mechanism for raising the course support means at the course pickup station, for maintaining the course support means raised during the carriage movement from the course pickup station to the course stacking station and for lowering the course support means at the course stacking station; and a drive means operatively connected to the crank shaft for rotating the crank shaft to progressively and smoothly accelerate the carriage from the course pickup station and to progressively and smoothly decelerate the carriage at the course stacking station.
Claim 2
Dependent Claim
225 words
In a lumber stacking apparatus: means for reciprocating a carriage between a course pickup station and a course stacking station and for vertically moving a course support means on the carriage to pick up a course of boards at the course pickup station and to maintain the course support means elevated as the carriage is moved from the course pickup station to the course stacking station and to lower the course of boards at the course stacking station, comprising: a rotatable crank shaft; a crank arm mechanism operatively connected between the carriage and the crank shaft to reciprocate the carriage between the course pickup station and the course stacking station in response to the rotation of the crank shaft; cam means operatively connected to and driven by the crank shaft in timed relation with the movement of the crank arm mechanism for raising the course support means at the course pickup station, for maintaining the course support means raised during the carriage movement from the course pickup station to the course stacking station and for lowering the course support means at the course stacking station; and a drive means operatively connected to the crank shaft for rotating the crank shaft to progressively and smoothly accelerate the carriage from the course pickup station and to progressively and smoothly decelerate the carriage at the course stacking station.
Claim 3
Dependent Claim
160 words
In the lumber stacking apparatus as defined in claim 1 wherein the drive means rotates the crank shaft approximately full circle at a substantially constant angular velocity during each cycle of operation to move the carriage in a forward stroke from the course pickup station to the course stacking station, and in a return strOke from the course stacking station to the course pickup station in preparation for a succeeding cycle and wherein the cam means includes a cam operatively connected to the crank shaft for rotation about an axis and a cam follower responsive to a contour of the cam and operable for raising and lowering the cam support means and wherein the cam contour has a first surface for engaging the cam follower at the beginning of the forward stroke to raise the course support means and a second surface for engaging the cam follower near the end of the forward stroke to lower the course support means.
Claim 4
Dependent Claim
68 words
In the lumber stacking apparatus defined in claim 2 wherein the cam means further includes a bell crank having one end operatively connected to the cam follower and another end operatively connected to means for engaging the course support means during the forward stroke to raise and lower the course support means in response to the engagement of the cam follower with the first and second surfaces respectively.
Claim 5
Dependent Claim
108 words
In the lumber stacking apparatus defined in claim 1 further comprising an open platform supporting a course of boards at the corresponding pickup station and wherein the course support means includes a forked arm structure mounted for horizontal movement with the carriage and for vertical movement up through the open platform in which the cam means is responsive to the rotation of the crank shaft engages and raises the forked arm structure at the course pickup station, maintains the forked arm structure raised during the carriage movement from the course pickup station to the course stacking station and lowers the forked arm structure at the course stacking station.
Claim 6
Dependent Claim
98 words
In the lumber stacking apparatus defined in claim 2 wherein the cam is timed in relationship to the rotation of the crank shaft and the first and second surfaces of the cam are designed to engage the cam roller to raise the course support means within a 20* of angular rotation from a zero angular position a fully contracted orientation of the crank mechanism and lower the course support means within a 30* of angular rotation of the crank shaft from a 180* angular position defined by the position of the crank mechanism in a fully extended position.
References Cited (Backward Citations)
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US2861702A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-02 | 1977-01-01 | 1977-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-02 | 1981-01-01 | 1981-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-02 | 1985-01-01 | 1985-07-03 | $7700.00 | Window Closed / Lapsed |