Sawmill log-handling system
AssigneeMcDonough Manufacturing Company
InventorRobert K. Detjen
Life of this patent
Estimating the term…
Abstract
Logs are advanced through a saw while they are engaged between driven pusher dogs and retarded hold-back dogs. The pusher dogs are mounted on a lower endless roller chain below the logs, and the hold-back dogs are on an upper endless roller chain above the logs. The upper chain and its hold-back dogs are vertically movable to elevations dependent on the elevation of a log, thus assuring proper engagement. When the sawed portion of a log is retained laterally on a support, the hold-back dogs are moved forwardly away from the log so that a hold-back dog will be in the path of the next log to be handled by the system.
Claims17
A sawmill log handling system for advancing logs longitudinally along a given path from an infeed side of a saw, through the saw and to an outfeed side of the saw, said system comprising,
- rear log-engaging means for engaging a rearward end of a log,
- forward log-engaing means for engaging a forward end of said log,
- a lower carrier means for supporting one of said log-engaging means, said lower carrier means being positioned below the given path of the log,
- an upper carrier means for supporting the other said log-engaging means, said upper carrier means being an endless member movable in a continuous path and positioned above the given path of the log,
- rear drive means for moving a said carrier means to advance the rear log-engaging means along said given path to carry said logs from said infeed side, through the saw and to said outfeed side,
- said forward log engaging means engaging a forward end of said log while said log is being moved by said rear drive means, said forward log-engaging means being movable from the infeed side to the outfeed side as the log is cut by the saw, and,
- forward drive motor means for moving said carrier means supporting the forward log-engaging means to drive the forward log engaging means forwardly away from the log after the log has passed through the saw.
A sawmill log handling system for advancing logs longitudinally along a given path from an infeed side of a saw, through the saw and to an outfeed side of the saw, said system comprising,
- rear log-engaging means for engaging a rearward end of a log,
- rear drive means for moving said rear log-engaging means along said given path to carry said logs from said infeed side, through the saw and to said outfeed side,
- forward log-engaging means for engaging a forward end of said log while said log is being moved by said rear drive means, said forward log-engaging means being movable from the infeed side to the outfeed side as the log is cut by the saw,
- a deactivated hydraulic motor coupled to said forward log-engaging means for retarding movement of the forward log-engaging means as the log is advanced through the saw by the drive means, whereby said log is grasped between the driven said rear log-engaging means and the retarded said forward log-engaging means.
A sawmill log handling system for advancing logs longitudinally along a given path from an infeed side of a saw, through the saw and to an outfeed of the saw, said system comprising,
- rear log-engaging means for engaging a rearward end of a log,
- rear drive means for moving said rear log-engaging means along said given path to carry said logs from said infeed side, through the saw and to said outfeed side,
- forward log-engaging means for engaging a forward end of said log while said log is being moved by said rear drive means, said forward log-engaging means being movable from the infeed side to the outfeed side as the log it cut by the saw,
- a log support means for underlying and supporting a log on the outfeed side of the saw, stabilizing means for retaining said log on the log support means to prevent lateral displacement of the log after sawing, and a forward drive motor means for advancing the forward log-engaging means to accellerate it forwardly from the log when the log is retained by the stabilizing means.
A sawmill log handling system for advancing logs longitudinally along a given path from an infeed side of a saw, through the saw and to an outfeed side of the saw, said system comprising,
- rear log-engaging means for engaging a rearward end of a log,
- rear drive means for moving said rear log-engaging means along said given path to carry said logs from said infeed side, through the saw and to said outfeed side,
- forward log-engaging means for engaging a forward end of said log while said log is being moved by said rear drive means, said forward log-engaging means being movable from the infeed side to the outfeed side as the log is cut by the saw,
- sensor means for sensing the elevation of the forward end of a log prior to its engagement with said forward log-engaging means, and means for moving the forward log-engaging means vertically in response to the elevation sensed by said sensor means.
Dependencies are inferred from the claim text.